{"id":76791,"date":"2020-04-04T19:42:31","date_gmt":"2020-04-04T17:42:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/amerikanczy-predlozhili-sobirat-energiyu-dlya-interneta-veshhej-iz-magnitnyh-polej-blizhajshej-elektroprovodki"},"modified":"2020-04-04T19:42:31","modified_gmt":"2020-04-04T17:42:31","slug":"amerikanczy-predlozhili-sobirat-energiyu-dlya-interneta-veshhej-iz-magnitnyh-polej-blizhajshej-elektroprovodki","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/amerikanczy-predlozhili-sobirat-energiyu-dlya-interneta-veshhej-iz-magnitnyh-polej-blizhajshej-elektroprovodki","title":{"rendered":"Gli americani propongono di raccogliere energia per l'Internet delle cose dai campi magnetici delle linee elettriche vicine","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Il tema dell'estrazione di elettricit\u00e0 dall'«aria» \u2015 dal rumore elettromagnetico, dalle vibrazioni, dalla luce, dall'umidit\u00e0 e da molte altre fonti \u2015 interessa sia i ricercatori civili che i loro colleghi in uniformi. Il proprio contributo a questo tema \u00e8 stato fornito da scienziati<\/a><\/noindex> dell'Universit\u00e0 della Pennsylvania. Dai campi magnetici delle linee elettriche vicine sono riusciti a estrarre energia elettrica con una potenza di alcuni milliwatt, sufficiente, ad esempio, per alimentare direttamente una sveglia digitale.<\/p>\n

\"Gli<\/p>\n

Nell'articolo pubblicato sulla rivista Energy & Environmental Science<\/a><\/noindex> gli scienziati hanno descritto i calcoli e la produzione di speciali convertitori di campi elettromagnetici in corrente elettrica. Il componente estrattore \u00e8 realizzato sotto forma di una piastra sottile a pi\u00f9 strati con un magnete permanente all'estremit\u00e0 libera (l'altra estremit\u00e0 della piastra \u00e8 saldamente fissata). La piastra stessa \u00e8 composta da uno strato di materiale piezoelettrico e uno strato di materiale magnetostrittivo<\/a><\/noindex> (Fe85B5Si10 Metglas).<\/p>\n

Il materiale magnetostrittivo \u00e8 interessante perch\u00e9, al variare dello stato di magnetizzazione, il suo volume e le dimensioni lineari cambiano. Il fastidioso ronzio delle bobine nelle schede video \u00e8, di norma, una conseguenza delle variazioni magnetostrittive nei nuclei. In un campo magnetico alternato di normali cavi elettrici a frequenza di 50 o 60 Hz, una lamina di Metglas inizia a vibrare e a deformare la lamina di piezoelettrico ad essa incollata. Nella rete collegata alle lamina inizia a fluire corrente.<\/p>\n

\"Gli<\/p>\n

Tuttavia, il materiale magnetostrittivo abbinato a un piezoelettrico genera solo fino al 16 % dell'elettricit\u00e0 prodotta dall'elemento. La principale produzione deriva dall'oscillazione di un magnete permanente in un campo elettromagnetico. Si afferma che la tensione di picco sull'elemento raggiunga 80 V in un campo di 300 \u00b5T. Ma la cosa pi\u00f9 preziosa \u00e8 che l'elemento sviluppato potrebbe estrarre una quantit\u00e0 sufficiente di energia per alimentare direttamente orologi digitali in un campo di meno di 50 \u00b5T a una distanza di 20 cm dai cavi elettrici.<\/p>\n

<\/center><\/p>\n

I loro studi sono stati condotti dai ricercatori dell'Universit\u00e0 della Pennsylvania insieme ai ricercatori della Virginia Tech e a un gruppo del Comando per lo sviluppo delle capacit\u00e0 di combattimento dell'esercito degli Stati Uniti.<\/p>\n

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Fonte: 3dnews.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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